Post-glacial uplift and substrate age at Cape Henrietta Maria, southeastern Hudson Bay, Canada

1970 ◽  
Vol 7 (2) ◽  
pp. 317-325 ◽  
Author(s):  
P. J. Webber ◽  
J. W. Richardson ◽  
J. T. Andrews
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
James Bay ◽  
Northern Ontario ◽  
Sea Levels ◽  
Biological Studies ◽  
History Of ◽  
Emergence Curve ◽  
Reasonable Prediction ◽  
Substrate Age

As a basis for future ecological and biogeographical studies, the post-glacial emergence history of Cape Henrietta Maria was required. This was obtained by fitting a post-glacial emergence curve to a number of radiocarbon dated marine strandlines of known elevation. Analysis shows that the elevation of lower samples is critical for a reasonable prediction of higher relative sea levels. This emergence curve suggests that during the last 1000 y uplift has been about 1.2 m per century. Extrapolation to likely dates of deglaciation (8000−7000 BP) indicates a maximum marine inundation of > 300 m. The current rate of uplift, and the hypothetical elevation of the marine limit are the highest estimations to date for eastern and arctic Canada and support the hypothesis that a center of uplift and ice-loading is situated in southeastern Hudson Bay and northern James Bay. The derived emergence curve was used to construct an isochrone map of Polar Bear Park, in eastern northern Ontario. This map provides the basis for future biological studies of community migration and succession and demonstrates that the uplift curve is a useful chronological tool.

scholarly journals The observed postglacial recovery of Québec and Nouveau-Québec Since 12,000 BP

2011 ◽  
Vol 31 (3-4) ◽  
pp. 389-400 ◽  
Author(s):  
J. T. Andrews ◽  
K. Tyler
Keyword(s):  
Ice Sheet ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Control Points ◽  
James Bay ◽  
Sea Levels ◽  
Ice Edge ◽  
Proglacial Lake ◽  
Relationship Of ◽  
The Relationship

Radiocarbon dated relative sea levels, the tilts of proglacial lake shorelines and raised marine shorelines, the directions of the tilt of these features, and postglacial delevelling are used to construct six isobase maps showing relative sea level movements over the last 12,000, 10,000, 8000, 4000, and 2000 years, No map has more than 30 control points and usually there are only 12 "good" points controlling the isobase patterns. Each map shows the relationship of the isobases to the current ice sheet extent. Along the southern margin of the Laurentide Ice Sheet, the maximum postglacial emergence has been quite uniform with the 240 to 200 m isobase always close to the ice margin. Along the northeastern margin of the ice sheet, the postglacial emergence at the retreating ice edge was closer to 100 m. Equidistant diagrams are drawn along planes southeast from southern Hudson Bay and eastward from Southampton Island. If these diagrams are compared on a Shoreline Relation Diagram, the two profiles appear similar and compare moderately well with a theoretical SR Diagram published in 1969. The isobases show a major uplift center located around the area of James Bay and southern Hudson Bay where a maximum emergence of nearly 300 m occured in the last 7500 years. High marine limits southwest of Ungava Bay need to be dated because if they date close to 8000 BP as we suggest, then more emergence is suggested for the region southwest of Ungava Bay than we currently allow for.

Lower Silurian reefs and post-reef beds of the Attawapiskat Formation, Hudson Bay Platform, northern Ontario

1993 ◽  
Vol 30 (3) ◽  
pp. 575-590 ◽  
Author(s):  
Daniel R. Suchy ◽  
Colin W. Stearn
Keyword(s):  
Debris Flow ◽  
Sea Level ◽  
Hudson Bay ◽  
Burial Diagenesis ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Northern Ontario ◽  
Sea Level Fluctuations ◽  
Wide Range ◽  
History Of

Outcrop exposures along the Attawapiskat River in the Hudson Bay Lowlands of northern Ontario clearly reveal the morphology of Silurian (upper Llandoverian) reefs of the Attawapiskat Formation and the relationships between reef cores, flanking beds, and post-reef beds. These relationships indicate that the reefs had a syndepositional relief of at least 8–10 m. The relief of the reefs is indicated by debris-flow lenses encased within flanking beds, a debris-flow fan at the base of a reef, thin reef-flanking beds truncated against a vertical reef face, penecontemporaneous brachiopod beds on the flanks of reefs, and three large slide blocks that apparently slid over the side of a reef.Reefs of the Attawapiskat Formation are largely limestones with a wide range of lithologies, from stromatoporoid-, coral-, and cement-rich boundstones to alga–cement-rich boundstones. Thick, laterally extensive Nuia grainstone beds, a product of widespread Nuia monocultures in supratidal to intertidal ponds, are present above the reefs. The most important diagenetic processes were early marine cementation (predominantly radial-fibrous calcite), shallow burial diagenesis, and pervasive neomorphism.Schematic reconstructions of the depositional history of the Attawapiskat Formation in outcrop, constructed from observations of outcrop relationships, show a stratigraphic succession that was controlled by relative-sea-level changes. Reefs growth was terminated by a relative-sea-level fall, but subsequent minor relative-sea-level fluctuations resulted in alternating deposition of supratidal to shallow subtidal sediments for a short time before the final retreat of the Silurian seas from the Hudson Bay Platform; only supratidal evaporite facies are present in the remainder of the Silurian section above the Attawapiskat Formation.

Evidence of a continent-wide fault system on the Attawapiskat River, Hudson Bay Platform, northern Ontario

1993 ◽  
Vol 30 (8) ◽  
pp. 1668-1673 ◽  
Author(s):  
Daniel R. Suchy ◽  
Colin W. Stearn
Keyword(s):  
Landsat Imagery ◽  
Aerial Photographs ◽  
Fault System ◽  
Reef Crest ◽  
Hudson Bay ◽  
James Bay ◽  
Northern Ontario ◽  
Lower Silurian

The grouping of areas of outcrop of Lower Silurian reefs along a stretch of the Attawapiskat River west of James Bay (northern Ontario, Canada) is controlled by a conjugate set of faults striking approximately 60 and 280°. The faults are evident in disturbed outcrops along the river and in subtle lineaments revealed in aerial photographs and Landsat imagery in the surrounding marshland topography. Slumping of large blocks from a reef crest in Silurian time and stratigraphic relationships within the Hudson Basin indicate a major episode of movement in late Llandovery time. Movements on the fault set have been traced back to Proterozoic time and, to affect the present subdued topography recently emerged from marine inundation, must have been renewed in rapid recent postglacial uplift of this area.

scholarly journals A New Remote Community-Owned Wireless Communication Service: Fort Severn First Nation Builds Their Local Cellular System with Keewaytinook Mobile

2012 ◽  
Vol 36 (4) ◽  
Author(s):  
Susan O'Donnell ◽  
George Kakekaspan ◽  
Brian Beaton ◽  
Brian Walmark ◽  
Raymond Mason ◽  
...  
Keyword(s):  
Wireless Communication ◽  
First Nation ◽  
Hudson Bay ◽  
Communication Service ◽  
Community Members ◽  
Northern Ontario ◽  
Remote Community ◽  
Mode De Vie ◽  
History Of ◽  
Tribal Council

ABSTRACT Fort Severn First Nation is a remote fly-in community on Hudson Bay. Its lifestyle reflects a deep respect for and connection to the land. The Keewaytinook Okimakanak (KO) Tribal Council has developed the Keewaytinook Mobile (KM) service in remote First Nation communities in Northern Ontario. In November 2009, Fort Severn and KO established the KM service in the community. This study traces the history of KM and its implementation in Fort Severn and describes how and why community members are using the service. The analysis is based on interviews and discussions with community members during three research visits between March 2010 to March 2011.RÉSUMÉ Fort Severn est une communauté isolée située sur les rives de la baie d’Hudson. Son mode de vie reflète un respect et un attachement profonds pour la terre. Le Conseil tribal Keewaytinook Okimakanak KKOL a développé le service mobile Keewaytinook dans les communautés autochtones reculées du Nord de l’Ontario. En novembre IGGJ, Fort Severn et KO ont établi ce service dans la communauté. Cette étude retrace l’histoire et la mise en place du service mobile à Fort Severn et décrit comment et pourquoi on y utilise ce service. L’analyse se fonde sur des entrevues et des discussions avec des membres de la communauté menées au cours de trois visites de recherche effectuées entre mars IGHG et mars IGHH.

scholarly journals The Omar Story: The Role of Omars in Assessing Glacial History of West-Central North America

2002 ◽  
Vol 54 (3) ◽  
pp. 257-270 ◽  
Author(s):  
Victor K. Prest ◽  
J. Allan Donaldson ◽  
Howard D. Mooers
Keyword(s):  
North America ◽  
Hudson Bay ◽  
Western Canada ◽  
Field Observations ◽  
Glacial History ◽  
Northern Ontario ◽  
West Central ◽  
History Of

Abstract The direction of Wisconsinan glacial dispersion of distinctive Proterozoic erratics derived from the Belcher Group in southeastern Hudson Bay is shown to have been northwestward, westward and southward for hundreds of kilometres across Hudson Bay, Northern Ontario, western Canada, and several adjoining northern States. The most distinctive of these erratics, termed "omars", are composed of massive siliceous wacke characterized by buff-weathering calcareous concretions; these erratics were derived from the Omarolluk Formation of the Belcher Group, exposed in the Belcher Islands of eastern Hudson Bay, and probably underlying much of the southern part of this inland sea. Far less common but equally distinctive are erratics of red oolitic jasper that were derived from the Kipalu Formation of the Belcher Group. In parallel with the now widely accepted field term "omar", we introduce the term "kipalu" for such erratics of oolitic jasper. A map showing the distribution of the distinctive erratics, in relation to indicators of Wisconsinan glacier movement, provides the basis for inferring at least two discrete glaciations that produced several major ice lobes. This paper summarizes the field observations of numerous Canadian and American earth scientists, traces the evolution of thought on provenance of the distinctive erratics, and outlines the criteria for distinguishing "true" omars from erratics derived from other bedrock sources of concretion-bearing wackes.

The Present Status of the Polar Bear in the James Bay and Belcher Islands Area, by Charles Jonkel, Pauline Smith, Ian Stirling & George B. Kolenosky. Canadian Wildlife Service, Occasional Paper No. 26, 42 pp., figs & tables, 22.9 × 16.4 × 0.4 cm, paperbound [no price indicated], 1976. - The Ecology of the Polar Bear (Ursus maritimus) along the Western Coast of Hudson Bay, by Ian Stirling, Charles Jonkel, Pauline Smith, Richard Robertson & Dale Cross. Canadian Wildlife Service, Occasional Paper No. 33, 64 pp., figs & tables, 28.5 × 16.5 × 0.5 cm, paperbound [no price indicated], 1977. - Dynamics of Snowshoe Hare Populations in the Maritime Provinces, by Thomas J. Wood & Stanley A. Munroe. (Canadian Wildlife Service, Occasionel Paper Number 30.) Minister of Supply and Services, Ottawa, Canada: 21 pp., figs & tables, 23 × 16 × 0.2 cm, paper cover [no price indicated], 1977. - Peary Caribou and Muskoxen on Western Queen Elizabeth Islands, NWT, 1972–74, by F. L. Miller, R. H. Russell & Anne Gunn. (Canadian Wildlife Service Report Series No. 40.) Printing and Publishing, Supply & ServicesCanada, Ottawa, Canada: 55 pp., figs & tables, 28 × 21.5 × 0.5 cm, stiff paper cover, Can. $ 4.00, 1977.

1979 ◽  
Vol 6 (3) ◽  
pp. 249-250
Author(s):  
J. F. D. Frazer
Keyword(s):  
Present Status ◽  
Polar Bear ◽  
Ursus Maritimus ◽  
Snowshoe Hare ◽  
Hudson Bay ◽  
Western Coast ◽  
James Bay ◽  
Maritime Provinces ◽  
Paper Cover ◽  
Canadian Wildlife

scholarly journals Observations sur l’influence hydrologique de la neige dans l’Est du Canada

2005 ◽  
Vol 2 (3) ◽  
pp. 75-86
Author(s):  
Christian Mingasson
Keyword(s):  
General Rule ◽  
Hudson Bay ◽  
James Bay ◽  
Maritime Provinces ◽  
Northern Ontario ◽  
Run Off ◽  
Northern Regions ◽  
Total Discharge ◽  
Flooding Period

This article deals with a group of 27 rivers all situated East of the 85 th meridian and South of Hudson Bay. In the first place, the author bas calculated the ratios of snow run-off during the springtime discharge. In the Maritime Provinces, the ratio obtained is only 20% of the total discharge (with a minimum of 17%) because of the rainy marine characteristics of the climate. In the Laurentian region, the ratio is close to 30% (maximum 35%) because of abundant snow precipitations and quite low summer discharge. One must note the retentional influence of lakes which display the flooding period jar beyond springtime and lower the spring ratio down to 23%. For instance, in Northern Ontario, due to losses in the marshy zones, the author bas found a ratio of only 19%. A second problem raised in this paper is the dating of the beginning of floods caused by the melting of snow. In the Southern parts of the Maritime provinces and of Ontario, the waters are high on April 5 th. In the Southern and Central parts of Québec, the flooding period begins between the 6 th and the 20 th of April. In the regions situated North of the St. Lawrence and South of James Bay, the flooding period usually begins after the 25 th of April. So the flooding period caused by the melting of snow happens later in the Northern regions. Finally, the author considers the monthly ratios of discharge during the month that knows the highest waters. Those ratios are between 2 and 3 (maximum 4.64) but they can lower down to 1.50 due to retention operated by the lakes. The month of maximum flooding extends from March, in the Southern parts of the zone covered by this study, to June, in the Northern parts. As a general rule, the figures found in this article are lower than those recorded for the rivers of the U.S.S.R.

Distribution and abundance of ringed (Phoca hispida) and bearded seals (Erignathus barbatus) in western Hudson Bay

1997 ◽  
Vol 54 (4) ◽  
pp. 914-921 ◽  
Author(s):  
N J Lunn ◽  
I Stirling ◽  
S N Nowicki
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
Phoca Hispida ◽  
Current Estimate ◽  
Ringed Seals ◽  
Erignathus Barbatus ◽  
The Mean ◽  
Western Hudson Bay ◽  
The Relationship ◽  
Bearded Seals

We flew a medium-altitude, systematic, strip-transect survey for ringed (Phoca hispida) and bearded seals (Erignathus barbatus) over western Hudson Bay in early June 1994 and 1995. The mean density (per square kilometre) of ringed seals hauled out on the ice was four times higher in 1995 (1.690) than in 1994 (0.380). The 1994 survey appeared to underestimate seal abundance because it was flown too late. Ringed seals preferred high ice cover habitat (6 + /8 ice) and, within this habitat, favoured cracking ice and large floes. We found no consistent effect of either wind or cloud cover on habitat preference. We estimated a total of 1980 bearded seals and 140<|>880 ringed seals hauled out on the sea ice in June 1995. A recent review of the relationship between ringed seal and polar bear (Ursus maritimus) populations suggests that a visible population of this size should support a population of up to 1300 polar bears, which is in general agreement with the current estimate of 1250-1300 bears in western Hudson Bay.

Morphological and isozyme variation in Salicornia europaea (s.l.) (Chenopodiaceae) in northeastern North America

1987 ◽  
Vol 65 (7) ◽  
pp. 1410-1419 ◽  
Author(s):  
S. L. Wolff ◽  
R. L. Jefferies
Keyword(s):  
North America ◽  
Atlantic Coast ◽  
Hudson Bay ◽  
Salicornia Europaea ◽  
Electrophoretic Variation ◽  
James Bay ◽  
Northeastern North America ◽  
Electrophoretic Patterns ◽  
Anther Length ◽  
Vegetative Characters

Morphological and electrophoretic variation has been documented within and among populations of Salicornia europaea L. (s.l.) in northeastern North America. Univariate and multivariate analyses (discriminant analyses) of measurements of floral and vegetative characters delimited three morphologically distinct groups of populations: Atlantic coast tetraploids (2n = 36), Hudson Bay diploids, and Atlantic coast and James Bay diploids (2n = 18). The two diploid groups were morphologically distinct from the midwestern diploid, S. rubra Nels., based on anther length, width of the scarious border of the fertile segment, and the overall width of the fertile segment. Electrophoretic evidence supported the delimitation of the three distinct morphological groups of populations of S. europaea with the exception of the population from James Bay, which had electrophoretic patterns identical with those of plants from Hudson Bay but resembled the Atlantic coast diploids morphologically. Most enzyme systems assayed were monomorphic. Only homozygous banding patterns were detected in diploid plants and electrophoretic variation was not observed within populations of S. europaea or S. rubra but was detected between groups of populations. Four multilocus phenotypes were evident; these corresponded to the major groups recognized on the basis of ploidy level and morphology. Reasons that may account for the paucity of isozymic variation are discussed.

scholarly journals Twitter under Storm: Social Media Response Sensitization in the Caribbean

2020 ◽  
Author(s):  
Danilo T Perez-Rivera ◽  
Alexis Josué Martínez ◽  
Adriana Pons ◽  
Alejandro Rodríguez-Natal ◽  
Sergio Andrés Davila-Santana
Keyword(s):  
Social Media ◽  
Emergency Preparedness ◽  
Previous History ◽  
The Bahamas ◽  
Sea Levels ◽  
History Of ◽  
The Caribbean ◽  
Rising Sea Levels ◽  
Hurricane Exposure ◽  
Effective Design

Climate change has led to rising sea levels and warmer sea surface temperatures. These factors contribute greatly to the intensity of hurricanes and floods they provoke. Projections estimate there will be an increase of 45% to 87% in the frequency of Category &gt;4 hurricanes originating in the Atlantic Basin, which typically impact the Caribbean and Continental United States of America. During the 2019 Hurricane Season, there were 20 depressions, 18 storms, 6 hurricanes and 3 major hurricanes. Through this work, we explored the response on Social Media to these natural phenomena as a function of their trajectory, intensity, and previous exposure of the population to intense natural disasters. Data was collected through the Twitter API. The influences of hurricane proximity and intensity on volume of Social Media production was explored. Hurricane Dorian, with its trajectory strongly threatening the previously exposed Puerto Rico, and eventually causing widespread damage in the Abaco Islands of the Bahamas, presented the strongest case for the evaluation of the dichotomy of responses between populations with differences in previous history of exposure. The landscape of historic hurricane exposure Caribbean has radically changed in recent years. Taking advantage of Big Data to help elucidate these dynamics could be instrumental in the tailoring of emergency preparedness plans and the effective design of mental health first aid strategies.

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